There is a person, lying on the burning sand, not even particularly arranging himself for less sand contact, eyes closed against the light, whimpering a little involuntarily now and again. He wasn't there the last time she checked.
Huh. Any besides the two sounds that provoked reactions before?
She can get First Sound three ways and Second Sound two ways.
She makes the sounds that provoke responses for a while longer, and then she goes back to sleep.
When she wakes up he's asleep again too, murmuring again.
She pays close attention so that she can repeat the sounds back to him when he's awake.
She has lots of new things to try!
She can get a THIRD SOUND with enough experimentation with the new words.
She repeats the third sound back to him.
He confirms it again.
She goes through the whole list of words that get responses again.
They are all the same.
She is pleased with the amount of a pattern that this is.
After a while she plays back the sound of him screaming, to see what he makes of that.
He ignores it.
She goes back to trying other sound patterns. Now she's going to string the sounds together and try to make all of the possible combinations of two, so she can see if any of those get responses.
Somewhat fewer of these get reactions but the ones that do get a slightly wider variety - four common responses, another half a dozen less common, one of which is significantly longer than the others.
She repeats the long response back to him.
She goes through all of the words and word combinations that got responses again.
Responses are about the same. One two-sound combination doesn't get an answer this time and the one that got a long answer before instead gets nothing.
Huh. She repeats the one that got the long answer a couple times.
Nothing again, then the long answer again.
She repeats the long answer again.
She tries... the long response and then all of the other responses?
He doesn't answer. He does roll over.
She goes back to trying sound combinations. When she's tried all of the combinations of two, she tries combinations of three, starting with combining the ones that got responses earlier.